1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  linux/arch/h8300/mm/init.c
  4 *
  5 *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
  6 *                      Kenneth Albanowski <kjahds@kjahds.com>,
  7 *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
  8 *
  9 *  Based on:
 10 *
 11 *  linux/arch/m68knommu/mm/init.c
 12 *  linux/arch/m68k/mm/init.c
 13 *
 14 *  Copyright (C) 1995  Hamish Macdonald
 15 *
 16 *  JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
 17 *  DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
 18 */
 19
 20#include <linux/signal.h>
 21#include <linux/sched.h>
 22#include <linux/kernel.h>
 23#include <linux/errno.h>
 24#include <linux/string.h>
 25#include <linux/types.h>
 26#include <linux/ptrace.h>
 27#include <linux/mman.h>
 28#include <linux/mm.h>
 29#include <linux/swap.h>
 30#include <linux/init.h>
 31#include <linux/highmem.h>
 32#include <linux/pagemap.h>
 33#include <linux/memblock.h>
 34#include <linux/gfp.h>
 35
 36#include <asm/setup.h>
 37#include <asm/segment.h>
 38#include <asm/page.h>
 39#include <asm/sections.h>
 40
 41/*
 42 * ZERO_PAGE is a special page that is used for zero-initialized
 43 * data and COW.
 44 */
 45unsigned long empty_zero_page;
 46
 47/*
 48 * paging_init() continues the virtual memory environment setup which
 49 * was begun by the code in arch/head.S.
 50 * The parameters are pointers to where to stick the starting and ending
 51 * addresses of available kernel virtual memory.
 52 */
 53void __init paging_init(void)
 54{
 55	/*
 56	 * Make sure start_mem is page aligned,  otherwise bootmem and
 57	 * page_alloc get different views og the world.
 58	 */
 59	unsigned long start_mem = PAGE_ALIGN(memory_start);
 60	unsigned long end_mem   = memory_end & PAGE_MASK;
 61
 62	pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
 63		 start_mem, end_mem);
 64
 65	/*
 66	 * Initialize the bad page table and bad page to point
 67	 * to a couple of allocated pages.
 68	 */
 69	empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 70	if (!empty_zero_page)
 71		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 72		      __func__, PAGE_SIZE, PAGE_SIZE);
 73
 74	/*
 75	 * Set up SFC/DFC registers (user data space).
 76	 */
 77	set_fs(USER_DS);
 78
 79	pr_debug("before free_area_init\n");
 80
 81	pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
 82		 start_mem, end_mem);
 83
 84	{
 85		unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
 86
 87		max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT;
 88		free_area_init(max_zone_pfn);
 89	}
 90}
 91
 92void __init mem_init(void)
 93{
 94	pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
 95
 96	high_memory = (void *) (memory_end & PAGE_MASK);
 97	max_mapnr = MAP_NR(high_memory);
 98
 99	/* this will put all low memory onto the freelists */
100	memblock_free_all();
101
102	mem_init_print_info(NULL);
103}